Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (01): 158.doi: 10.3969/j.issn.0251-0790.2012.01.027

• Physical Chemistry • Previous Articles     Next Articles

Catalytic Performances of Co-Pd/TiO2 Catalysts Prepared with Mixed Cobalt Salts for Acetic Acid Synthesis from CH4 and CO2 by a Step-wise Reaction Sequence

GAO Zhong-Liang, HUANG Wei, YIN Li-Hua, JI Peng, ZHAO Jin-Zhen, LIU Yuan, PENG Fen   

  1. Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Institute of Coal Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2011-03-08 Online:2012-01-10 Published:2011-12-20
  • Contact: Wei HUANG E-mail:huangwei@tyut.edu.cn

Abstract: Co-Pd/TiO2 catalysts were prepared from mixed cobalt salts by incipient impregnation method. The catalytic performance of the catalysts for direct synthesis of acetic acid from CH4 and CO2 by a step-wise reaction technology was investigated. These catalysts were also characterized by XRD, XPS, NH3-TPD and BET. The results show that when the precursor is from mixed cobalt salts, a suitable surface acidity, high specific surface area and pore structure are formed, which favors the activity of catalysts. On the condition of m(CoCl2)∶m=2∶5, m(Co)∶m(Pd)=2∶1 and 150 ℃, the formation rate and selectivity of acetic acid reach 6.13 mg·g-1Cat·h-1and 81.6%, respectively. Compared with the catalysts prepared from single cobalt, the rate and selectivity increase by 134% and 16%.

Key words: Mixed cobalt salts, Co-Pd/TiO2 catalyst, CH4-CO2 step-wise reaction, Acetic acid

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